This is happening to one of my Mirage DNA75C devices, as well. Thought perhaps it was the fault of the RDA I was using (Drop), but it happens with every RDA, RTA, and SubOhm tank I attach, even with an adjustable 510, I still have the issue. I also see in this thread that there's a service pack 27, but it doesn't show up on Escribe. It only goes up to SP25. What am I doing wrong? I've been a long time user of DNA200, 250, 166, 133 but never a DNA75C. It's a great device, but a bit annoying when I go to take a pull and nothing happens, only to see the message about a new or old coil.